Class 12th

The current in an inductor is given by $i = 2 + 3 t$ ampere where t is in second. The self?induced emf in it is $9 m V$ ; the energy stored in the inductor at t=1 second is

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Please find the answer below

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A current 1 flows along the length of an infinitely long, straight and thin?walled pipe. Then:

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The magnetic field at any point inside the pipe is zero

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Two long conductors, separated by a distance d carry current $I_{1}$ and $I_{2}$ in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3 d. The new value of the force between them is

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$F \propto \frac{i_{1} i_{2}}{a}$ Since one of the current increase two times

and distance increases three times, so force become $\frac{2}{3}$ times. Also due to the reversal of direction of current force becomes negative.

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A neutral point is obtained at the Centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is

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$θ = 90 °$

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As the switch S is closed in the circuit shown in figure, current passed through it is

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Let V be the potential of the junction as shown in figure. Applying junction law, we have

or $\frac{20 - V}{2} + \frac{5 - V}{4} \bar{\to} \frac{V - 0}{2}$

or $40 - 2 V + 5 - V = 2 V$ or $5 V = 45 \Rightarrow V = 9 V$

$∴ i_{3} = \frac{V}{2} = 4.5 A$

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The power of a heating coil is P. It is cut into two equal parts. The power of one of them across same mains is

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Class 12th Physics Electrostatic Potential and Capacitance

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Please consider the following Image

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Before connecting the circuit shown in figure all capacitors were uncharged. The circuit now is in steady state. Now the switch $S$ is closed. During the time the steady state is reached again:

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Before closing the switch

After closing the switch

So charge on C₁ remains same, on C₂ increases and on C₃ and C₄ decreases.

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Explain Magnetic Flux according to the Class 12 Physics Electromagnetic Induction.

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Pallavi Pathak

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The sum of a magnetic field that passes through a given surface area is called the magnetic flux. The mathematic formula is? = BA cos (? ).

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What is Ohm's law in Electromagnetic Induction?

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Pallavi Pathak

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Ohm's Law states that when the temperature remains constant, the current (I) flowing through a conductor is directly proportional to voltage (v), and inversely proportional to resistance (R).

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